Yes, you can install a 1x PCIe card into a 16x or 4x PCIe slot

PCIe x1 slots are used by the weakest cards

PCI Express adapter slots Hot - swap power supplies 750w 750w RAID controller M5110e M5110e M5110e 512MB Flash M5110e 512MB Flash Model 7915-23x 1x E5-2637

1 reel demi gods iv slot PCI Express x16 PCI Express x16 PCI Express x16 PCI Express 1 x USB 1 x USB Gen 1 Type-C 1 x USB Gen 2 Type-A 1 x

1_8 slot cutter router bit MSI Ventus GeForce RTX 2060 12GB GDDR6 PCI Express x16 ATX Video Card RTX 20